Supporting device for bed

Abstract

A supporting device for a bed, placed on a bed plate, on top of or below a mattress, comprises a head-end inflatable bag, shaped like a triangular prism and placed at a determined position close to a head end of the bed plate, a foot-end inflatable bag, shaped like a triangular prism and placed at a determined position close to a foot end of the bed plate, and a compressor for inflating the head-end and foot-end inflatable bags. A person lying on the bed plate is supported by the head-end and foot-end inflatable bags on the upper body and the legs, respectively, assuming a sitting position upon inflating thereof and returning to a lying position upon deflating thereof.

1 . A supporting device for a bed, placed on a bed plate, on top of or below a mattress, comprising:
 a head-end inflatable bag, shaped like a triangular prism and placed at a determined position close to a head end of the bed plate;   a foot-end inflatable bag, shaped like a triangular prism and placed at a determined position close to a foot end of the bed plate; and   a compressor, connected to said head-end and foot-end inflatable bags via conduits, for inflating said head-end and foot-end inflatable bags;   wherein a person lying on the bed plate is supported by said head-end and foot-end inflatable bags on the upper body and the legs, respectively, assuming a sitting position upon inflating thereof and returning to a lying position upon deflating thereof.   
   
   
       2 . The supporting device for a bed of  claim 1 , wherein said head-end and foot-end inflatable bags are placed below said mattress in fixed positions. 
   
   
       3 . The supporting device for a bed of  claim 1 , wherein said head-end and foot-end inflatable bags are fixed on said bed plate. 
   
   
       4 . The supporting device for a bed of  claim 1 , wherein said head-end and foot-end inflatable bags are connected with each other.